// Copyright 2013-2016 Serilog Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Serilog.Sinks.File;

static class Clock
{
    static Func<DateTime> _dateTimeNow = () => DateTime.Now;

    [ThreadStatic]
    static DateTime _testDateTimeNow;

    public static DateTime DateTimeNow => _dateTimeNow();

    // Time is set per thread to support parallel
    // If any thread uses the clock in test mode, all threads
    // must use it in test mode; once set to test mode only
    // terminating the application returns it to normal use.
    public static void SetTestDateTimeNow(DateTime now)
    {
        _testDateTimeNow = now;
        _dateTimeNow = () => _testDateTimeNow;
    }
}
